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Why is magic blue?

I've been working on making my own game, and as a result I've started thinking about general video game tropes differently. One thing that has stumped me is the question in the title. Why exactly is magic represented as a blue bar in many games? I can understand health being red, as that ties into blood and the heart and red as a colour representing good health, but blue for magic? That one seems arbitrary to me. When I realized that I would need a bar to represent something to do with magic, the colour I instantly knew it had to be was blue.

I don't have an extensive background regarding old CRPGs, but I suspect the convention may have started with them (or even the PnP games they were based off of). Is it simply that blue was an unused primary colour and was more appealing visually than yellow, or is there also some deeper symbolism going on of which I am ignorant?

since the fleshy parts were symbolised with the colour of blood aka red, they made the spiritual energy aka Mana was made what people thought to be the opposite thus the colour blue. And it sorta stuck. But then back in the old Zelda games the Mana potions were green and the blue potions were for Mana and Health at the same time.

Magic represents something further away from the worldly, from the flesh. And as such, body, health, flesh, is symbolized with red. The counterpart to red is blue, as most people, from before video games and modern fiction, concluded is. Therefore, the soul, magic, is symbolized with blue. It's a tradition from before video games, seen in some literary works as well. It also has connections to the royal "blue" blood, seen as special and magical, above average.

I suppose because magic is mostly considered a gift from the gods, either explicit or implicit and thus outside of nature. Now blue is a somewhat rare color in nature, besides from the skies which most religions considered the homestead of their respective gods.

Traditionally, purple is associated with royalty and such, since in ye olden days it had to be extracted from snails and was therefore extremely expensive.